Optimum amplitude and phase control for an adaptive linear array using a genetic algorithm

Phase-only adaptive nulling cannot generate nulls at symmetric locations about the main beam, and it has a slower convergence rate than amplitude and phase adaptive nulling. Phase-only nulling places a null at one angle, and it causes the sidelobe at the symmetric location to go up. The amplitude and phase adaptive nulling with a genetic algorithm (GA) overcomes these problems. The performance of amplitude and phase adaptive nulling with a GA are compared with that of phase-only adaptive nulling with a GA. In addition, the best bit setup of amplitude or phase adaptive nulling with a GA is found in terms of the convergence speed and null depths when the interference is incident at various locations-single, adjacent, symmetric and non-symmetric about the main beam. The 32 element half wavelength spaced linear array is used and simulated, and the power of the symmetric, non-symmetric and adjacent interference are symmetric.